On the beach of Arromanches you can see some wide concrete boxes at the surface of the sea. They are the relics of « Port Winston » or « Mulberry B », one of the two artificial harbours built by the Allies to land the men, supplies and equipment necessary for the Battle of Normandy.

The harbour of Arromanches was composed of 71 Phoenix blockships, 500 meters of unloading quays and 8 floating roads wavering with the tide.